Overline does not stretch with webFont "Neo-Euler".

Created by: PeterLuschny

In an expression like s^{\overline{k-1}} the overline does not stretch in the following setting:

"HTML-CSS": { availableFonts: [], preferredFont: null, webFont: "Neo-Euler", scale: 90 }

src="http://beta.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML"

Similarly \underline. (Things work with webFont: "TeX".) Tested in FF25 and Chrome30.0.